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CT Angiography of the Lower Extremity Venous System — With or Without IV Contrast

Published: August 9, 2026Updated: August 16, 2026

A CT scan that uses injected contrast to examine veins in the legs for clots, narrowing, or other abnormalities.

Quick summary

["This scan helps identify and map problems involving the veins of the legs."]

Medically reviewed by WellAlly Editorial TeamLast reviewed August 16, 2026Editorial policy

Key facts at a glance

LOINC
30807-2
Short code
CTA LE ves WO+W contr IV
Synonyms
CTA LE ves WO+W contr IV
Category
liver
Sample
serum
Container
Red-top tube (SST)
Units
N/A
Fasting
false
Population
adult
Sex
all
Age range
18–65 years
Method
ct-angio
Specimen volume
5 mL
Stability
Room temperature: 4h, Refrigerated: 24h, Frozen: 7d
Hemolysis max
500
Lipemia max
1000
Icterus max
500
TAT
4–24 hours
Order
routine

What is this test?

Lower extremity CT angiography is an imaging test that creates detailed pictures of the veins in one or both legs. Intravenous contrast may be used to make the blood vessels easier to see.

Why might I need this test?

The test may be ordered to investigate leg swelling, pain, suspected deep vein thrombosis, or other symptoms of impaired blood flow. It can also help guide treatment or monitor certain vascular conditions.

How is the test performed?

You lie on a CT table while the scanner takes images around the legs. If contrast is used, it is given through a vein in your arm, and the scan may include images before and after contrast.

How do I prepare for the test?

Follow the instructions provided by the imaging center, including whether to avoid food or drinks beforehand. Tell the care team about kidney problems, contrast allergy, pregnancy, or any recent contrast imaging, as these may affect the procedure.

Clinical interpretation

How abnormal results are interpreted and what conditions they suggest.

Findings may indicate a blood clot, vein narrowing, inflammation, or altered blood flow. The results are interpreted together with symptoms, examination findings, and other tests and should be reviewed with your clinician.

Short name

Lower Extremity CT Angiogram

Frequently asked questions

Is this test the same as a routine CT scan?
No. This is a specialized CT angiogram focused on the leg veins, and intravenous contrast may be used to show the vessels more clearly.
Does the test involve radiation?
Yes. CT scans use ionizing radiation, although the scan is generally brief and is performed only when the expected benefit outweighs the risk.
How soon will the results be available?
Timing varies by facility. Your clinician can explain when the report will be available and how the findings will be communicated to you.
  1. 1
    MedlinePlus — Laboratory TestsSource
  2. 2
    Lab Tests OnlineSource
  3. 3
    Mayo Clinic — Tests & ProceduresSource

Click any link to access the full source. PubMed Central (PMC) links provide free full-text access.

This information is for educational purposes only and is not a substitute for professional medical advice, diagnosis, or treatment.

Medical Disclaimer

This content is for general informational and educational purposes only and is not a substitute for professional medical advice, diagnosis, or treatment. Always seek the guidance of a qualified healthcare provider with any questions you have about a medical condition, and never disregard professional medical advice or delay seeking it because of something you read here.

If you think you may have a medical emergency, call your local emergency number or go to the nearest emergency department immediately.

Medically reviewed by WellAlly Editorial Team Last reviewed August 16, 2026. · Read our editorial policy